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Yosemite blows the Asus m4a87td inbuilt usb power away on wake up from sleep (it can't seem to reset the usb section of the SB850 chip after sleep), so install a USB2 PCI card or a USB3 PCIe card that's compatible with OSX (preferably a NEC chip card or whatever) and disable inbuilt USB in the bios, and sleep and usb should work.

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can you please, please explain in details how to install Yosemity with the bronya kernel on this Asus Board?

I can not suceed....

Thank you very much!

Markus

This is how I did it.

I eventually booted the Niresh 10.10.1 Yosemite Zone off a usb stick (after a few failed tries) using /amd64 -v -x npci=0x3000 pci=off

I needed npci=0x3000 for my Geforce card otherwise I would get a hang at PCI configuration begin.

I also needed to disable "C1E Support" in the bios otherwise it would hang at ioapic.

I could then get to the installer and I installed Yosemite.

Then I chose some options at the end of the installer for the chameleon bootloader and additional kexts, ncpi=0x3000 and GraphicsEnabler=Yes and a few others to do with ahci injector kexts and PS2 kexts etc.

I could then boot Yosemite from my hard disk.

I got sound working using VoodooHDA VT1708S.kext.zip

What happened with the amd64 kernel was that the icon highlighting and selection was working in a weird way and also some other problems, so I looked around for other kernels to try and after a few different kernels the Bronya Yosemite RC7 kernel worked perfectly and I havn't had any troubles since I installed it.

The kernel is in /System/Library/Kernels and to change it to Bronya's RC7 kernel I did this using Terminal

I then dragged the Cache folder in /System/Library to the trash and shutdown the computer, and Yosemite automatically rebuilds all of the caches on shutdown and restart.

I also had some graphics error trouble with the default Nvidia drivers for my card (Geforce 460), so I installed the updated Nvidia web drivers for Yosemite 10.10.1 and there are no graphics errors anymore.

Disabling "C1E Support" and "Cool'n'Quiet" can actually increase Sata performance in some cases.

Apple's USB drivers basically expect an Intel USB compliant chipset (or NEC USB chipset) which I don't think is the case with the USB in the SB850 Southbridge chip and the SB850 Southbridge chip also has a few USB bugs or quirks (published by AMD) that other operating systems like Windows and Linux can work around because they have SB850 drivers, so on OSX the USB stops working after sleep due to some Apple USB driver reset issue, so I just installed an NEC based USB2 PCI card (a USB3 card might also work) and disabled the inbuilt (SB850) USB in the bios and USB and sleep is working.